Stack-based Buffer Overflow in Tenda A21 by Tenda
CVE-2026-2874

8.7HIGH

Key Information:

Vendor

Tenda
Status
A21
Vendor
CVE Published:
21 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2874?

A security flaw exists in the Tenda A21 version 1.0.0.0 affecting the function 'form_fast_setting_wifi_set' within the '/goform/fast_setting_wifi_set' file. An attacker can exploit this vulnerability by manipulating the 'ssid' argument, which may result in a stack-based buffer overflow. This condition could allow unauthorized users to remotely execute malicious code, compromising the security of the device. Prompt remediation is highly advisable to prevent potential exploitation.

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Affected Version(s)

A21 1.0.0.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-2874 - Proof of Concept

References

https://vuldb.com/?id.347111
vdb-entrytechnical-description
https://vuldb.com/?ctiid.347111
signaturepermissions-required
https://vuldb.com/?submit.754636
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

hhsw34 (VulDB User)
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